Rockford Fosgate P3D4-15 Punch P3 15" subwoofer with dual 4-ohm voice coils - Breakers Stereo and Performance
Amazon.com: DS18 PSW12.2D 12" Shallow Mount Subwoofer 1200 Watts Max Power 600 Watts RMS Dual Voice Coil 2+2 OHMS Water Resistant - Best Sub for Tight Spaces in Car & Trucks - 1 Speaker : Electronics